The keyword "VOLATILE" is used to define a variable so as to inform the compiler that the variable value can change at any instant of time and is not a constant through out the program.
Interview Question: How the compiler treats any volatile variable?
Explanation: A volatile variable is one whose VALUE CAN CHANGE UNEXPECTEDLY. Consequently, the compiler can make NO ASSUMPTIONS about the value of the variable. In particular,the optimizer must be careful to RELOAD the variable every time it is used instead of holding a copy in a register.
Examples of volatile variables are:
(a) Hardware registers in peripherals (e.g., status registers)
(b) Non-stack variables referenced within an interrupt service routine.
(c) Variables shared by multiple tasks in a multi-threaded application.
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